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Distribution and Chemical Composition of Lignin in Secondary Xylem of Cactaceae
Chemistry & Biodiversity ( IF 2.3 ) Pub Date : 2021-09-08 , DOI: 10.1002/cbdv.202100431 Agustín Maceda 1 , Jorge Reyes-Rivera 2 , Marcos Soto-Hernández 1 , Teresa Terrazas 3
Chemistry & Biodiversity ( IF 2.3 ) Pub Date : 2021-09-08 , DOI: 10.1002/cbdv.202100431 Agustín Maceda 1 , Jorge Reyes-Rivera 2 , Marcos Soto-Hernández 1 , Teresa Terrazas 3
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Cactaceae family has heterogeneity in the accumulation of lignocellulose due to the diversity of shapes and anatomy of the wood. Most studies focus on fibrous and dimorphic species; but the non-fibrous species are poorly studied. The aims of this work were to analyze the syringyl/guaiacyl ratio of lignin and its distribution in secondary xylem, especially in non-fibrous species. The syringyl/guaiacyl (S/G) ratio was quantified from 34 species of cacti by nitrobenzene oxidation of free-extractive wood. The distribution of lignocellulose in wood sections stained with safranin O/fast green was determined with epifluorescence microscopy. The S/G ratio was heterogeneous; most of the non-fibrous species had a higher percentage of syringyl, while the fibrous ones accumulate guaiacyl. Fluorescence emission showed that vessel elements and wide-band tracheids had similar tonalities. It is hypothesized that the presence of a higher percentage of syringyl in most cacti is part of the defense mechanism against pathogens, which together with the succulence of the stem represent adaptations that contribute to survival in their hostile environments.
中文翻译：
仙人掌次生木质部木质素的分布及化学成分
由于木材的形状和解剖结构的多样性，仙人掌科在木质纤维素的积累方面具有异质性。大多数研究集中在纤维和二形物种；但对非纤维种类的研究很少。这项工作的目的是分析木质素的丁香基/愈创木基比率及其在次生木质部中的分布，尤其是在非纤维物种中。通过硝基苯氧化自由萃取木材，从 34 种仙人掌中量化丁香基/愈创木基 (S/G) 比率。木素纤维素在用番红 O/固绿染色的木材切片中的分布是用落射荧光显微镜确定的。S/G 比率是异质的；大多数非纤维种类的丁香基比例较高，而纤维种类则积累愈创木酚。荧光发射表明血管元素和宽带管胞具有相似的色调。据推测，大多数仙人掌中存在较高百分比的丁香基是抵御病原体的防御机制的一部分，与茎的多汁一起代表了有助于在其敌对环境中生存的适应性。
更新日期：2021-10-19
中文翻译：
仙人掌次生木质部木质素的分布及化学成分
由于木材的形状和解剖结构的多样性，仙人掌科在木质纤维素的积累方面具有异质性。大多数研究集中在纤维和二形物种；但对非纤维种类的研究很少。这项工作的目的是分析木质素的丁香基/愈创木基比率及其在次生木质部中的分布，尤其是在非纤维物种中。通过硝基苯氧化自由萃取木材，从 34 种仙人掌中量化丁香基/愈创木基 (S/G) 比率。木素纤维素在用番红 O/固绿染色的木材切片中的分布是用落射荧光显微镜确定的。S/G 比率是异质的；大多数非纤维种类的丁香基比例较高，而纤维种类则积累愈创木酚。荧光发射表明血管元素和宽带管胞具有相似的色调。据推测，大多数仙人掌中存在较高百分比的丁香基是抵御病原体的防御机制的一部分，与茎的多汁一起代表了有助于在其敌对环境中生存的适应性。
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